Definition of "derail"
noun:
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A device placed on railway tracks causing a train to derail.
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verb:
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To cause to come off the tracks.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
To come off the tracks.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
To deviate from the previous course or direction.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
To cause to deviate from a set course or direction.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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